Jesus' footprints and the first catacombs in the world.

2300-year-old Roman road connecting the empire.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This bridge was constructed from the rubble of the infamous Bastille.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Hear the quietest sound from across the dome.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

San Francisco's newly reopened hands-on science museum.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

An unusual round church in London with a Templar past.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Odd outsider art installations surround a Gold Rush-era ghost town.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A trash dump made beautiful by nature's power.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The magic's in the hole!

Portlandia is the second-largest copper repoussé statue in the United States.